Ultrafast lasers represent one of the most advanced and transformative developments in modern photonics, characterized by their ability to emit extremely short pulses of light typically measured in femtoseconds (10⁻¹⁵ seconds) or picoseconds (10⁻¹² seconds). Unlike continuous-wave lasers or longer-pulse systems, ultrafast lasers deliver energy in incredibly brief bursts, allowing for precise interaction with materials at microscopic and even atomic levels.
The fundamental advantage of ultrafast lasers lies in their high peak power combined with low average energy input. Because the laser pulse duration is so short, energy is concentrated into a brief moment, creating extremely high intensities. This allows nonlinear optical effects to occur, such as multiphoton absorption, where materials absorb multiple photons simultaneously to induce changes that would not be possible under normal light conditions.
